Sportsmanship is an aspiration or ethic that a sport or activity will be enjoyed for its own sake. This is with proper consideration for fairness, ethics, respect, and a sense of fellowship with one's competitors. A sore loser refers to one who does not take defeat well.

Sportsmanship refers to virtues such as fairness, self-control, hard work, persistence, and is associated with interpersonal concepts of treating others & being treated fairly with respect. The most common offence of bad sportsmanship is the act of cheating to gain an unfair advantage this is called unsportsmanlike conduct and can be attributed to an opponent's self-esteem. Sore loser behavior includes not accepting responsibility for personal actions that contributed to the defeat, making excuses, and citing unfavorable conditions or other petty issues as reasons.

A bad winner acts in a shallow fashion after their victory by gloating about their win and lowering the opponent's self-esteem by constantly reminding the opponent of poor performance even if the opponent competed well. Pride & ego are often the root cause.

Examples of fair sportsmanship include shaking hands, encouragement, cheer, clap or hi-five, and be respectful to everyone including teammates and opposition. Foremost, its often encouraged and said that "It's not whether you win or lose, it's how you play the game." In the end, everyone loses when sportsmanship is not practiced in any competitive event.

More Info: en.wikipedia.org